Grundig Satellit 2000 repair question

[Schnitzer]

Trying to repair my Grundig Satellit 2000 which I greatly enjoy. Have a found problem in the audio ampflier section. A Zener diode has failed. The parts list identifies the diode as a ZV1. Searching on this part number in Google and in cross references for semiconductors, I have not been able to find any info or substitutes. Some cross references say that at least 4 characters of ID is needed.

Can anyone provide help for identifying this zener diode or advising which part I should replace it with??????????